Understanding BGP active/passive neighborships

XtremeIE's J.P. Cedeno explains active/passive sides of a BGP relationship, as well as how to manipulate it.
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[@koudry]

Thanks for explaining in a simple the mechanism of BGP passive and active peering. I understand the mechanism itself but what I do not understand is why would one want to control which peers actively try to establish the connection.
(1) What is the rationale behind this? What are we trying to achieve? Is this to reduce the amount of memory and CPU utilisation on the device, knowing that BGP database is resource hungry?
(2) What is the consequence in terms of BGP updates when a peer is configured as passive?
I am familiar with setting RIPv2, EIGRP and OSPF interfaces to passive and the change of behaviour that results from that.

[@leratom99]

Hi Koudry, ever got an answer to your quesition perhaps at a different forum?
I am quite keen to know the reason behind being able to control who actively establishes a session.

[@procopiobucaio8840]

Thank you.